Eminem made a rare appearance in New York Wednesday to support his protégé. The elusive rapper was seen sneaking in through the back entrance of The Box to watch Skylar Grey perform during a release party for her new album, “Don’t Look Down.” We’re told Eminem was immediately escorted to the VIP area upstairs at the Steve Madden-sponsored event, where he was “cordial but not overly friendly.” After the set, he went backstage to congratulate Grey.